https://community.sony.lt/t5/x-series/phone-won-t-install-apks-from-unknown-source/m-p/3585059#M8101 <P><A href="https://community.sony.co.uk/t5/user/viewprofilepage/user-id/1125990">@Johanbat</A>&nbsp;do you use a screen filter app like Twilight, Flux or any other apps that are supposed to provide night mode/blue light filter? you'll have to temporarily disable them when installing apps from the apk files.&nbsp;</P> Sun, 25 Feb 2018 18:17:43 GMT najodleglejszy 2018-02-25T18:17:43Z https://community.sony.lt/t5/x-series/phone-won-t-install-apks-from-unknown-source/m-p/3585058#M8100 <P>Can you help me. My xperia F5121 won't install apk from other sources can only install from play stores. unknown souces is checked in security settings..please help stuggeling with this from 2 updates back.&nbsp;</P> Mon, 19 Feb 2018 16:25:49 GMT https://community.sony.lt/t5/x-series/phone-won-t-install-apks-from-unknown-source/m-p/3585058#M8100 Johanbat 2018-02-19T16:25:49Z https://community.sony.lt/t5/x-series/phone-won-t-install-apks-from-unknown-source/m-p/3585059#M8101 <P><A href="https://community.sony.co.uk/t5/user/viewprofilepage/user-id/1125990">@Johanbat</A>&nbsp;do you use a screen filter app like Twilight, Flux or any other apps that are supposed to provide night mode/blue light filter? you'll have to temporarily disable them when installing apps from the apk files.&nbsp;</P> Sun, 25 Feb 2018 18:17:43 GMT https://community.sony.lt/t5/x-series/phone-won-t-install-apks-from-unknown-source/m-p/3585059#M8101 najodleglejszy 2018-02-25T18:17:43Z